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Date: Tue, 2 Jan 2024 23:21:36 +0000 Message-ID: <20240102232136.38778-1-Ashish.Kalra@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF0000343F:EE_|BL1PR12MB5270:EE_ X-MS-Office365-Filtering-Correlation-Id: 2448efd4-ea16-4695-4a09-08dc0be997da X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(346002)(396003)(39860400002)(136003)(376002)(230922051799003)(64100799003)(451199024)(1800799012)(186009)(82310400011)(40470700004)(36840700001)(46966006)(2906002)(26005)(2616005)(47076005)(83380400001)(41300700001)(336012)(356005)(81166007)(16526019)(1076003)(426003)(82740400003)(36860700001)(316002)(8676002)(8936002)(54906003)(7416002)(4326008)(5660300002)(478600001)(70206006)(6666004)(6916009)(70586007)(7696005)(86362001)(36756003)(40460700003)(40480700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jan 2024 23:21:48.1937 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2448efd4-ea16-4695-4a09-08dc0be997da X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF0000343F.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5270 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1787022787474227472 X-GMAIL-MSGID: 1787022787474227472 From: Ashish Kalra Some BIOSes allow the end user to set the minimum SEV ASID value (CPUID 0x8000001F_EDX) to be greater than the maximum number of encrypted guests, or maximum SEV ASID value (CPUID 0x8000001F_ECX) in order to dedicate all the SEV ASIDs to SEV-ES or SEV-SNP. The SEV support, as coded, does not handle the case where the minimum SEV ASID value can be greater than the maximum SEV ASID value. As a result, the following confusing message is issued: [ 30.715724] kvm_amd: SEV enabled (ASIDs 1007 - 1006) Fix the support to properly handle this case. Fixes: 916391a2d1dc ("KVM: SVM: Add support for SEV-ES capability in KVM") Signed-off-by: Ashish Kalra Cc: stable@vger.kernel.org --- arch/x86/kvm/svm/sev.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 4900c078045a..ad41008ca0d9 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -59,10 +59,14 @@ module_param_named(sev_es, sev_es_enabled, bool, 0444); /* enable/disable SEV-ES DebugSwap support */ static bool sev_es_debug_swap_enabled = true; module_param_named(debug_swap, sev_es_debug_swap_enabled, bool, 0444); + +/* When true, at least one type of SEV guest is enabled to run */ +static bool sev_guests_enabled; #else #define sev_enabled false #define sev_es_enabled false #define sev_es_debug_swap_enabled false +#define sev_guests_enabled false #endif /* CONFIG_KVM_AMD_SEV */ static u8 sev_enc_bit; @@ -1854,7 +1858,7 @@ int sev_mem_enc_ioctl(struct kvm *kvm, void __user *argp) struct kvm_sev_cmd sev_cmd; int r; - if (!sev_enabled) + if (!sev_guests_enabled) return -ENOTTY; if (!argp) @@ -2172,8 +2176,10 @@ void sev_vm_destroy(struct kvm *kvm) void __init sev_set_cpu_caps(void) { - if (!sev_enabled) + if (!sev_guests_enabled) { kvm_cpu_cap_clear(X86_FEATURE_SEV); + return; + } if (!sev_es_enabled) kvm_cpu_cap_clear(X86_FEATURE_SEV_ES); } @@ -2229,9 +2235,11 @@ void __init sev_hardware_setup(void) goto out; } - sev_asid_count = max_sev_asid - min_sev_asid + 1; - WARN_ON_ONCE(misc_cg_set_capacity(MISC_CG_RES_SEV, sev_asid_count)); - sev_supported = true; + if (min_sev_asid <= max_sev_asid) { + sev_asid_count = max_sev_asid - min_sev_asid + 1; + WARN_ON_ONCE(misc_cg_set_capacity(MISC_CG_RES_SEV, sev_asid_count)); + sev_supported = true; + } /* SEV-ES support requested? */ if (!sev_es_enabled) @@ -2262,7 +2270,8 @@ void __init sev_hardware_setup(void) if (boot_cpu_has(X86_FEATURE_SEV)) pr_info("SEV %s (ASIDs %u - %u)\n", sev_supported ? "enabled" : "disabled", - min_sev_asid, max_sev_asid); + sev_supported ? min_sev_asid : 0, + sev_supported ? max_sev_asid : 0); if (boot_cpu_has(X86_FEATURE_SEV_ES)) pr_info("SEV-ES %s (ASIDs %u - %u)\n", sev_es_supported ? "enabled" : "disabled", @@ -2270,6 +2279,7 @@ void __init sev_hardware_setup(void) sev_enabled = sev_supported; sev_es_enabled = sev_es_supported; + sev_guests_enabled = sev_enabled || sev_es_enabled; if (!sev_es_enabled || !cpu_feature_enabled(X86_FEATURE_DEBUG_SWAP) || !cpu_feature_enabled(X86_FEATURE_NO_NESTED_DATA_BP)) sev_es_debug_swap_enabled = false; @@ -2278,7 +2288,7 @@ void __init sev_hardware_setup(void) void sev_hardware_unsetup(void) { - if (!sev_enabled) + if (!sev_guests_enabled) return; /* No need to take sev_bitmap_lock, all VMs have been destroyed. */ @@ -2293,7 +2303,7 @@ void sev_hardware_unsetup(void) int sev_cpu_init(struct svm_cpu_data *sd) { - if (!sev_enabled) + if (!sev_guests_enabled) return 0; sd->sev_vmcbs = kcalloc(nr_asids, sizeof(void *), GFP_KERNEL);